Which of the following is false about Gram-negative bacteria? Select one: O A. They are generally less resistant to antibiotics than Gram-positive bacteria O B. They have an outer membrane which contains lipopolysaccharides O C. Their cell walls have smaller amount of peptidoglycan than those of Gram-positive bacteria O D. Upon Gram staining, they become pink or red in color O E. Their outer membrane provides protection against the immune system of the host

Which of the following is false about Gram-negative bacteria? Select one: O A. They are generally less resistant to antibiotics than Gram-positive bacteria O B. They have an outer membrane which contains lipopolysaccharides O C. Their cell walls have smaller amount of peptidoglycan than those of Gram-positive bacteria O D. Upon Gram staining, they become pink or red in color O E. Their outer membrane provides protection against the immune system of the host

Body Structures & Functions Updated

13th Edition

ISBN:9780357191606

Author:Scott

Publisher:Scott

Chapter16: Infection Control And Standard Precautions

Section: Chapter Questions

Problem 5ATC

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How do Gram-negative bacteria differ from Gram-positivebacteria?a. They are not pathogenic.b. Their peptidoglycan cell wall is thinner.c. Gram-negative bacteria cannot be Gram stained.d. They possess a single plasma membrane.e. Gram-negative bacteria do not photosynthesize.
When hydrogen peroxide is placed on a colony of an unknown bacterium, bubbles form. Based on this information, you can conclude that the bacteriuma) is Staphylococcus epidermidis.b) is a lactic acid bacterium.c) is beta-hemolytic.d) is catalase-positive.e) can cause strep throat.
Which of the following statements is a reason why Acid-Fast Bacteria resist the Gram stain a) Because their cell wall architecture varies from both gram-negative and gram-positive bacteria. b) Because they lack the peptidoglycan layer. c) Because they have a thick peptidoglycan layer. d) Because they have a thick layer of fatty acids.
Viruses were first described as “filterable agents” meaningthat(a) They were often discovered on filters used to retain mi-crobes(b) The filters that were used to sterilize microbial mediawould trap viruses(c) They would pass through filters that were capable of re-taining the smallest known bacteria(d) They were found to aggregate into structures that servedas coarse filters.
The structures that enable some Gram-positive bacteria to remaindormant for extremely long periods of time are known asa. akinetes. b. endospores. c. biofilms. d. lipopolysaccharide envelopes. e. pili.
What is it about clams that make them especially likelysources of human infection?(a) They have sticky interiors that make microorganism at-tachments easy.(b) Their ability to glow with Photobacterium phosphor-eum attracts pathogenic species of microorganisms.(c) They are best eaten raw.(d) They are filter feeders, obtaining food by filtering waterand extracting microbes.(e) Their hard outer shell seals in and concentrates anycontaminating microbes.
The broth culture of Bacillus subtilis showed growth even after extended heating in a waterbath, while Serratia marcescens did not. This is due to: a. Bacillus subtilis is Gram-positive, while Serratia marcescens is Gram-negative b. Bacillus subtilis is a spore former c. the pigment of Serratia marcescens absorbs more radiation than other cells d. Bacillus subtilis has enzymes that protect it from ozone
Which of the following is present in both gram-positive and gramnegativecell walls?a. an outer membrane. c. teichoic acidb. peptidoglycan d.lipopolysaccharides
The LPS layer in gram-negative cell walls releases ___________ thatcause _______________ .a. enzymes, pain c. techoic acid, inflammationb. endotoxins, fever d. phosphates, lysis
Which type of bacteria is responsible for producing ex-tremely toxic sulfuric acid?(a) Thiobacillus (d) Sulfur-oxidizing(b) Sulfate-reducing (e) a and d(c) Sulfur-reducing
Why are Pseudomonas aeruginosa infections difficult to treat? A. Because they form biofilms, which are difficult for antibiotics to penetrate. B. Because they have a special endotoxin that degrades many antibiotics. C. Because we do not have any antibiotics that target P. aeruginosa. D. Because they are gram-positive bacteria, which are harder to treat.
Compared with their growth in the laboratory, bacteria innature generally growa) more slowly.b) faster.c) at the same rate.